Which injectors do i have?

604 Views 9 Replies 4 Participants Last post by Whiteonyx86, Nov 28, 2005

xleonx

Discussion Starter · Nov 26, 2005

The car is a 92 laser AWD turbo

Im just curious, how do I determine which injectors I have? I bought the car with a SAFC and all of its current mods, except for the FMIC I put on it... I did the FMIC already since I could afford it, and Im not good at saving.

Anyways, it has a 2G MAF... when i tune using a SAFCII, A/F Gauge, and a Pocketlogger tuning for ZERO knock, Im at -7% correction at Hi-throttle... The car also has a ported big16G, and OEM fuel pump. I havent put the 255 on it yet, because I discovered I needed a AFPR first.

So, theres no way this correction could be accurate if I had the 450CC stock injectors, like the previous owner said, right? So how do I determine which injectors I have?

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boosted90awd

· #2 · Nov 26, 2005

being -7% at wot i would think you hve 550s. its hard to tell but with 660s you would have to pull alot more fuel out than that to keep from dumping an insane amount of fuel in the cylinders. But that depends on how much booost your running out of the 16g. it would be my guess of 550s. by the way how much are you taking out at low throttle?

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xleonx

Discussion Starter · #3 · Nov 26, 2005

I havent been taking any out at low throttle, because its harder to tune, and I wanted to figure out which injectors I had.

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boosted90awd

· #4 · Nov 26, 2005

You need to check on a logger to see what your fuel trims are. if the trims are around 100% and you have no eeprom chip your looking at 450's. I would like to think your trims will b extremly low. somewhere in the 80's and that would most likely mean 550s. I doubt the car will even run at idle with 660s with the stock fuel map.

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xleonx

Discussion Starter · #5 · Nov 28, 2005

Fuel Trim Hi- 81%
Fuel Trim Mid- 110%
Fuel Trim Low- 139%

so whats that mean?

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Whiteonyx86

· #6 · Nov 28, 2005

instead of jacking around with the settings until something screws up, id take them out and get em flow tested so you know what they really are...or...ask the person you bought it from

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xleonx

Discussion Starter · #7 · Nov 28, 2005

Well, I have to learn some way... which is the point of the post... Im not messing around with stuff, im trying to learn my way around this program. I asked the person I bought it from, and they said they were stock injectors... but he obviously didnt know what he was talking about...

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cdstalon

· #8 · Nov 28, 2005

Why not? Your fuel trim at low is almost at the point of max adjustment up (it's been a whiel since I had a 1g, but I thought the max was 140%) which shows that you are pretty lean at idle. The 2g MAF will lean you out some, and the SAFC is leaned out a tad as well so 450s sound about right... With 550s and a 2g MAS, you should not see 139% at idle.

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boosted90awd

· #9 · Nov 28, 2005

agreed i would say 450s

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Whiteonyx86

· #10 · Nov 28, 2005

xleonx said:
Well, I have to learn some way... which is the point of the post... Im not messing around with stuff, im trying to learn my way around this program. I asked the person I bought it from, and they said they were stock injectors... but he obviously didnt know what he was talking about...

it's better to be safe than to be sorry..if the tops are blue then they are 450's

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